. the woman was not hurt and did not finish the race. >> president obama is vowing justice for the victims of the boston bombings. here's a picture of mr. obama as he received the news from boston and short time later he addressed the nation. >> make no mistake we will get to the bottom of this. and we will find out who did this. find out why they did this. any responsible individuals, any responsible groups will feel the full weight of justice. >> members of congress observe a moment of silence tonight for the bombing vichlts chairman of the house committee on homeland security says this is a terrorist attack and the question is whether terrorism is foreign or domestic. >> people in boston pitching in to help those affected by the bombings. hundreds of people offered to host them in their homes for free. offering a bed or couch or ride whatever they can do to help. it's going on right now through google drive. >> mean time boston police relessed phone number for people to call to try to reunite with family friends. that number and we have it on the bottom of the screen is listed here.